101
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Wang K, Groom M, Sheridan R, Zhang S, Block E. Liquid sulfur as a reagent: synthesis of polysulfanes with 20 or more sulfur atoms with characterization by UPLC-(Ag+)-coordination ion spray-MS. J Sulphur Chem 2012. [DOI: 10.1080/17415993.2012.721368] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Kai Wang
- a Department of Chemistry , University at Albany, SUNY , Albany , NY , 12222 , USA
| | - Murree Groom
- b ECOspray Limited , Grange Farm, Hilborough, Norfolk , IP26 5BT , UK
| | - Robert Sheridan
- c NYS Department of Agriculture and Markets , Food Laboratory Division , Albany , NY , 12235 , USA
| | - Shaozhong Zhang
- a Department of Chemistry , University at Albany, SUNY , Albany , NY , 12222 , USA
| | - Eric Block
- a Department of Chemistry , University at Albany, SUNY , Albany , NY , 12222 , USA
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102
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Abstract
The multiplicity of chemical structures of sulfur containing compounds, influenced in part by the element's several oxidation states, directly results in diverse modes of action for sulfur-containing natural products synthesized as secondary metabolites in plants. Sulfur-containing natural products constitute a formidable wall of defence against a wide range of pathogens and pests. Steady progress in the development of new technologies have advanced research in this area, helping to uncover the role of such important plant defence molecules like endogenously-released elemental sulphur, but also deepening current understanding of other better-studied compounds like the glucosinolates. As studies continue in this area, it is becoming increasingly evident that sulfur and sulfur compounds play far more important roles in plant defence than perhaps previously suspected.
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Affiliation(s)
- Ifeanyi D. Nwachukwu
- Department of Plant Physiology (Bio III) RWTH Aachen University, 52056 Aachen, Germany
| | - Alan J. Slusarenko
- Department of Plant Physiology (Bio III) RWTH Aachen University, 52056 Aachen, Germany
| | - Martin C. H. Gruhlke
- Department of Plant Physiology (Bio III) RWTH Aachen University, 52056 Aachen, Germany
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103
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Rebouças JS, Patrick BO, James BR. Thiol, disulfide, and trisulfide complexes of Ru porphyrins: potential models for iron-sulfur bonds in heme proteins. J Am Chem Soc 2012; 134:3555-70. [PMID: 22224472 DOI: 10.1021/ja211226e] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Thirty-two Ru(porp)L(2) complexes have been synthesized, where porp = the dianion of meso-tetramesitylporphyrin (TMP) or meso-tetrakis(4-methylphenyl)porphyrin (H(2)T-pMe-PP), and L = a thiol, a sulfide, a disulfide, or a trisulfide. Species studied were with RSH [R = Me, Et, (n)Pr, (i)Pr, (t)Bu, Bn (benzyl), and Ph], RSR (R = Me, Bn), RSSR (R = Me, Et, (n)Pr, Bn) and MeSS(t)Bu, and RSSSR (R = Me, Bn). All the species except two, which were the isolated Ru(T-pMe-PP)((t)BuSH)(2) and Ru(TMP)(MeSSMe)(2), were characterized in situ. The disulfide complex was characterized by X-ray analysis. (1)H NMR data for the coordinated thiols are the first reported within metalloporphyrin systems, and are especially informative because of the upfield shifts of the axial sulfur-containing ligands due to the porphyrin π-ring current effect, which is also present in the di- and trisulfide species. The disulfide in the solid state structure of Ru(TMP)(MeSSMe)(2) is η(1)(end-on) coordinated, the first example of such bonding in a nontethered, acyclic dialkyl disulfide; (1)H-(1)H EXSY NMR data in solution show that the species undergoes 1,2-S-metallotropic shifts. Stepwise formation of the bis(disulfide) complex from Ru(TMP)(MeCN)(2) in solution occurs with a cooperativity effect, resembling behavior of Fe(II)-porphyrin systems where crystal field effects dominate, but ligand trans-effects are more likely in the Ru system. The η(1)(end-on) coordination mode is also favored for the trisulfide ligand. Discussed also are the remarkable linear correlations that exist between the ring-current shielding shifts for the axial ligand C(1) protons of Ru(porp)(RS(x)R)(2) and x (the number of S atoms). The Introduction briefly reviews literature on Ru- and Fe porphyrins (including heme proteins) with sulfur-containing ligands or substrates, and relationships between our findings and this literature are discussed throughout the paper.
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Affiliation(s)
- Júlio S Rebouças
- Departamento de Química, CCEN, Universidade Federal da Paraíba, João Pessoa, PB, 58.051-900, Brazil.
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104
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Anwar A, Burkholz T, Scherer C, Abbas M, Lehr CM, Diederich M, Jacob C. Naturally occurring reactive sulfur species, their activity against Caco-2 cells, and possible modes of biochemical action. J Sulphur Chem 2011. [DOI: 10.1080/17415990802195623] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Awais Anwar
- a Division of Bioorganic Chemistry , School of Pharmacy, Saarland University , Saarbruecken, Germany
| | - Torsten Burkholz
- a Division of Bioorganic Chemistry , School of Pharmacy, Saarland University , Saarbruecken, Germany
| | - Christiane Scherer
- a Division of Bioorganic Chemistry , School of Pharmacy, Saarland University , Saarbruecken, Germany
- b Fondation Recherche sur le Cancer et les Maladies du Sang, Laboratoire de Biologie Moléculaire et Cellulaire du Cancer (LBMCC) , Hôpital Kirchberg , Luxembourg
| | - Muhammad Abbas
- a Division of Bioorganic Chemistry , School of Pharmacy, Saarland University , Saarbruecken, Germany
| | - Claus-Michael Lehr
- c Department of Biopharmaceutics and Pharmaceutical Technology , School of Pharmacy, Saarland University , Saarbruecken, Germany
| | - Marc Diederich
- b Fondation Recherche sur le Cancer et les Maladies du Sang, Laboratoire de Biologie Moléculaire et Cellulaire du Cancer (LBMCC) , Hôpital Kirchberg , Luxembourg
| | - Claus Jacob
- a Division of Bioorganic Chemistry , School of Pharmacy, Saarland University , Saarbruecken, Germany
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105
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Chung WJ, Simmonds AG, Griebel JJ, Kim ET, Suh HS, Shim IB, Glass RS, Loy DA, Theato P, Sung YE, Char K, Pyun J. Elemental Sulfur as a Reactive Medium for Gold Nanoparticles and Nanocomposite Materials. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104237] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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106
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Chung WJ, Simmonds AG, Griebel JJ, Kim ET, Suh HS, Shim IB, Glass RS, Loy DA, Theato P, Sung YE, Char K, Pyun J. Elemental Sulfur as a Reactive Medium for Gold Nanoparticles and Nanocomposite Materials. Angew Chem Int Ed Engl 2011; 50:11409-12. [DOI: 10.1002/anie.201104237] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Indexed: 11/06/2022]
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107
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Zeng T, Ziegelgruber KL, Chin YP, Arnold WA. Pesticide processing potential in prairie pothole porewaters. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:6814-6822. [PMID: 21751789 DOI: 10.1021/es200812e] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Prairie pothole lakes (PPLs) are located within the extensively farmed Great Plains region of North America, and many are negatively impacted by nonpoint source pesticide pollution. To date, the environmental fate of pesticides in these lakes remains largely unknown. In this study, two PPLs in the Cottonwood Lake area of North Dakota were sampled, and transformations of four chloroacetanilide pesticides in sediment porewaters were examined. The reduced sulfur species in the porewaters, such as bisulfide (HS(-)) and polysulfides (S(n)(2-)), readily transformed the target pesticides into sulfur-substituted products. Although HS(-) and S(n)(2-) played a dominant role, other reactive constituents in PPL porewaters also contributed to the transformation. Results from this study revealed that abiotic reactions with reduced sulfur species could represent an important removal pathway for pesticides entering PPLs.
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Affiliation(s)
- Teng Zeng
- Department of Civil Engineering, University of Minnesota, 500 Pillsbury Drive Southeast, Minneapolis, Minnesota 55455, USA
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108
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Zhang Q, Xiao HB, Huang ZY. Are the structures of (5n8) clusters featured by two connected carbons or by two separated carbons? J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2011.04.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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109
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Okuma K, Munakata K. Reaction of Thiofenchone or Thiochamphor with Disulfur Dichloride: Novel Formation of Tricyclic Polysulfanes. PHOSPHORUS SULFUR 2011. [DOI: 10.1080/10426507.2010.524174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Kentaro Okuma
- a Department of Chemistry , Fukuoka University , Jonan-ku, Fukuoka, Japan
| | - Kazunori Munakata
- a Department of Chemistry , Fukuoka University , Jonan-ku, Fukuoka, Japan
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110
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Grainger RS, Patel B, Kariuki BM, Male L, Spencer N. Sulfur Monoxide Transfer fromperi-Substituted Trisulfide-2-oxides to Dienes: Substituent Effects, Mechanistic Studies and Application in Thiophene Synthesis. J Am Chem Soc 2011; 133:5843-52. [DOI: 10.1021/ja108865w] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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111
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van Leerdam RC, van den Bosch PLF, Lens PNL, Janssen AJH. Reactions between methanethiol and biologically produced sulfur particles. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:1320-1326. [PMID: 21210662 DOI: 10.1021/es102987p] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Recently, new biotechnological processes have been developed to enable the sustainable removal of organic and inorganic sulfur compounds from liquid and gaseous hydrocarbon streams. In comparison to existing technologies (e.g., caustic scrubbing or iron based redox technologies) far less chemicals are consumed, while reusable elemental sulfur is formed as the main end-product. This research shows that in these processes a number of consecutive reactions occur between methanethiol (MT) from the hydrocarbon stream and the formed biosulfur particles, leading to the formation of (dimethyl) polysulfides. This is an important feature of this family of new bioprocesses as it improves the MT removal efficiency. The reaction kinetics depend on the MT and biosulfur concentration, temperature, and the nature of the biosulfur particles. The first reaction step involves a S8 ring-opening by nucleophilic attack of MT molecules to form CH3S9(-). This work shows that CH3S9(-) reacts to polysulfides (S3(2-), S4(2-), S5(2-)), dimethyl polysulfides [(CH3)2S2, (CH3)2S3], and dissociated H2S, while also some longer-chain dimethyl polysulfides [(CH3)2S4-7] are formed at μM levels. Control experiments using orthorhombic sulfur flower (S8) did not reveal these reactions.
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Affiliation(s)
- R C van Leerdam
- Sub-department of Environmental Technology, Wageningen, The Netherlands.
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112
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Decken A, Mailman A, Passmore J, Rautiainen JM, Scherer W, Scheidt EW. A prototype hybrid 7π quinone-fused 1,3,2-dithiazolyl radical. Dalton Trans 2011; 40:868-79. [DOI: 10.1039/c0dt00967a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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113
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Schneider T, Ba LA, Khairan K, Zwergel C, Bach ND, Bernhardt I, Brandt W, Wessjohann L, Diederich M, Jacob C. Interactions of polysulfanes with components of red blood cells. MEDCHEMCOMM 2011. [DOI: 10.1039/c0md00203h] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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114
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Saito M, Yamamoto T, Osaka I, Miyazaki E, Takimiya K, Kuwabara H, Ikeda M. Facile synthesis of [1]benzothieno[3,2-b]benzothiophene from o-dihalostilbenes. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.07.152] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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115
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Pristatsky P, Cohen SL, Krantz D, Acevedo J, Ionescu R, Vlasak J. Evidence for trisulfide bonds in a recombinant variant of a human IgG2 monoclonal antibody. Anal Chem 2010; 81:6148-55. [PMID: 19591437 DOI: 10.1021/ac9006254] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The hinge region of human IgG2 contains four cysteine residues involved in disulfide linkages between the heavy chains, as well as the heavy and light chains. These linkages provide the fundamental framework of three distinct IgG2 disulfide isoforms recently described. Here, we detail another, disulfide-related post-translational modification in a recombinant variant of human IgG2. Heterogeneity associated with this antibody was separated into several fractions by anion-exchange chromatography (AEX), which is an important initial step that highlights the resolving power of surface charge-based HPLC techniques. Mass spectrometry of the intact antibody revealed weakly resolved discrete covalent additions of 25-35 Da in one of the two main AEX fractions. Digestion by endoproteinase Lys-C performed under nonreducing conditions, as well as tandem MS experiments, narrowed the modification to the peptide-containing disulfide-bridged hinge structure. High mass resolution and accuracy measurements of the peptide strongly suggested an addition of one or two S atoms. The modification could be eliminated by a mild reducing treatment of the intact antibody. Overall, these findings are consistent with the replacement of up to two disulfide bridges (S-S) with a like number of trisulfides (S-S-S) in the antibody hinge. The trisulfide modification is rather uncommon for proteins and its possible origins in the IgG2 variant are discussed.
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Affiliation(s)
- Pavlo Pristatsky
- Merck Research Laboratories, West Point, Pennsylvania 19486, USA
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116
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Okuma K, Tsubota T, Tabuchi M, Kanto M, Nagahora N, Shioji K, Yokomori Y. Reaction of Thiochamphor with Disulfur Dichloride: Novel Formation of α-Disulfine. CHEM LETT 2010. [DOI: 10.1246/cl.2010.648] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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117
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Kückmann TI, Sänger I, Bolte M, Wagner M, Lerner HW. The supersilylated tetrasulfane tBu3Si-S4-SitBu3: Synthesis, structure, and its reaction behavior towards [Fe(CO)5]. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.01.040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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118
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Kimura T, Takahashi N, Sasage M, Namauo T, Ogawa S, Sato R. Preparation of pentathiepinoquinoline via ipso-substitution reactions of phenylsulfinyl and iso-propylsulfinyl groups with sulfur anions in liquid ammonia. J Sulphur Chem 2009. [DOI: 10.1080/17415990902902985] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Takeshi Kimura
- a Center for Instrumental Analysis , Iwate University , Morioka, Iwate, 020-8551, Japan
| | - Nobuyuki Takahashi
- b Department of Chemical Engineering, Faculty of Engineering , Iwate University , Morioka, Iwate, 020-8551, Japan
| | - Masato Sasage
- b Department of Chemical Engineering, Faculty of Engineering , Iwate University , Morioka, Iwate, 020-8551, Japan
| | - Toshiharu Namauo
- a Center for Instrumental Analysis , Iwate University , Morioka, Iwate, 020-8551, Japan
| | - Satoshi Ogawa
- b Department of Chemical Engineering, Faculty of Engineering , Iwate University , Morioka, Iwate, 020-8551, Japan
| | - Ryu Sato
- b Department of Chemical Engineering, Faculty of Engineering , Iwate University , Morioka, Iwate, 020-8551, Japan
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119
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Synthesis and redox-enzyme modulation by amino-1,4-dihydro-benzo[d][1,2]dithiine derivatives. Tetrahedron Lett 2009; 50:3023-3026. [PMID: 20161292 DOI: 10.1016/j.tetlet.2009.03.209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
A convenient method to prepare a series of benzodithiine derivatives was developed, via the synthesis of cyclic disulfide building blocks containing an amino-group linker. Some of the novel cyclic disulfide compounds are shown to modulate the activity of the redox-enzyme glutathione reductase.
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120
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Ishii A, Suzuki M, Sone T, Nakata N. Oxidation and Reduction Reactions of cis-9,10,11-Trithiabicyclo[6.3.0]undecane Synthesized by Reaction of cis-Cyclooctene with S8O. PHOSPHORUS SULFUR 2009. [DOI: 10.1080/10426500902855232] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Akihiko Ishii
- a Department of Chemistry, Graduate School of Science and Engineering , Saitama University , Saitama, Japan
| | - Manami Suzuki
- a Department of Chemistry, Graduate School of Science and Engineering , Saitama University , Saitama, Japan
| | - Taeko Sone
- a Department of Chemistry, Graduate School of Science and Engineering , Saitama University , Saitama, Japan
| | - Norio Nakata
- a Department of Chemistry, Graduate School of Science and Engineering , Saitama University , Saitama, Japan
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121
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Lee SH. Disulfide and multisulfide antitumor agents and their modes of action. Arch Pharm Res 2009; 32:299-315. [DOI: 10.1007/s12272-009-1300-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2008] [Revised: 12/20/2008] [Accepted: 01/11/2009] [Indexed: 11/25/2022]
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122
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Denk MK. The Variable Strength of the Sulfur-Sulfur Bond: 78 to 41 kcal - G3, CBS-Q, and DFT Bond Energies of Sulfur (S8) and Disulfanes XSSX (X = H, F, Cl, CH3, CN, NH2, OH, SH). Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200800880] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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123
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van den Bosch PLF, de Graaff M, Fortuny-Picornell M, van Leerdam RC, Janssen AJH. Inhibition of microbiological sulfide oxidation by methanethiol and dimethyl polysulfides at natron-alkaline conditions. Appl Microbiol Biotechnol 2009; 83:579-87. [PMID: 19333598 PMCID: PMC7419365 DOI: 10.1007/s00253-009-1951-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2009] [Revised: 03/05/2009] [Accepted: 03/05/2009] [Indexed: 11/29/2022]
Abstract
To avoid problems related to the discharge of sulfidic spent caustics, a biotechnological process is developed for the treatment of gases containing both hydrogen sulfide and methanethiol. The process operates at natron-alkaline conditions (>1 mol L−1 of sodium- and potassium carbonates and a pH of 8.5–10) to enable the treatment of gases with a high partial CO2 pressure. In the process, methanethiol reacts with biologically produced sulfur particles to form a complex mixture predominantly consisting of inorganic polysulfides, dimethyl disulfide (DMDS), and dimethyl trisulfide (DMTS). The effect of these organic sulfur compounds on the biological oxidation of sulfide to elemental sulfur was studied with natron-alkaliphilic bacteria belonging to the genus Thioalkalivibrio. Biological oxidation rates were reduced by 50% at 0.05 mM methanethiol, while for DMDS and DMTS, this was estimated to occur at 1.5 and 1.0 mM, respectively. The inhibiting effect of methanethiol on biological sulfide oxidation diminished due to its reaction with biologically produced sulfur particles. This reaction increases the feasibility of biotechnological treatment of gases containing both hydrogen sulfide and methanethiol at natron-alkaline conditions.
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Affiliation(s)
- Pim L F van den Bosch
- Sub-department of Environmental Technology, Wageningen University, Bomenweg 2, P. O. Box 8129, 6700 EV Wageningen, The Netherlands.
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124
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van den Bosch PLF, Fortuny-Picornell M, Janssen AJH. Effects of methanethiol on the biological oxidation of sulfide at natron-alkaline conditions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2009; 43:453-459. [PMID: 19238979 DOI: 10.1021/es801894p] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The effects of methanethiol (MT) on biological sulfide oxidation were studied in a continuously operated bioreactor, in which chemolithoautotrophic bacteria belonging to the genus Thioalkalivibrio convert hydrogen sulfide (H2S) at natron-alkaline conditions. Previous bioreactor experiments have shown that always a fraction of the H2S is oxidized to sulfate and thiosulfate. This is unwanted, as it leads to caustic requirements for pH control and the formation of a bleed stream to discharge these compounds from the process. The current research shows that due to the addition of MT, sulfate formation is prevented. As a result, all supplied H2S is completely converted into elemental sulfur. Treatment of a continuous supply of 51.0 mM day(-1) H2S and 79 microM day(-1) MT was feasible for a prolonged period, with 99 mol% selectivity for sulfur formation. A part of the MT reacts with the freshly produced sulfur particles to form dimethyl disulfide (DMDS) and dimethyl trisulfide (DMTS). Results indicate that MT, DMDS, and DMTS partly adsorb onto the biosulfur particles. At concentrations above 10 microM, these volatile organic sulfur compounds induce biomass decay.
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Affiliation(s)
- Pim L F van den Bosch
- Sub-department of Environmental Technology, Wageningen University, Bomenweg 2, P.O. Box 8129, 6700 EV Wageningen, The Netherlands.
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125
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Jacob C, Anwar A. The chemistry behind redox regulation with a focus on sulphur redox systems. PHYSIOLOGIA PLANTARUM 2008; 133:469-80. [PMID: 18346080 DOI: 10.1111/j.1399-3054.2008.01080.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Sulphur metabolism in plants provides a wealth of natural products, including several chemically unusual substances, such as thiosulphinates, polysulphides and isothiocyanates. Many of these reactive sulphur species (RSS) exhibit a distinct redox behaviour in vitro, which translates into a rather interesting biological activity in vivo, such as antibiotic, fungicidal, pesticidal or anticancer activity. While the molecular basis for such activity has long remained obscure, research into sulphur-based redox systems during the past 5-10 years has achieved a better knowledge of the in vitro properties of RSS and has led to an improved understanding of their impact on intracellular redox signalling and control pathways in living cells. It has become apparent that the redox chameleon sulphur occurs in biological systems in about 10 different oxidation states, which give rise to an extensive and complicated network of sulphur-based redox events. Together, natural sulphur products from plants and their intracellular targets provide the basis for innovative design of novel antibiotics, fungicides, pesticides and anticancer agents.
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Affiliation(s)
- Claus Jacob
- Division of Bioorganic Chemistry, School of Pharmacy, Universitaet des Saarlandes, Campus B 2.1, PO Box 151150, D-66123 Saarbruecken, Germany.
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126
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Abstract
Rhodium complexes are efficient catalysts for the synthesis of organosulfur compounds. They catalyze the addition reaction of organosulfur groups to unsaturated compounds, the substitution of C-H with organosulfur groups, and single-bond metathesis reactions. They cleave S-S bonds and transfer the organosulfur groups to various organic and inorganic molecules, including alkynes, allenes, disulfides, sulfur, isonitriles, imines, diphosphines, thiophosphinites, hydrogen, 1-alkylthio-1-alkynes, thioesters, and allyl sulfides.
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Affiliation(s)
- Mieko Arisawa
- 1Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Sendai 980-8578, Japan
| | - Masahiko Yamaguchi
- 1Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Sendai 980-8578, Japan
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127
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Deng S, Wu T, Hu G, Li D, Zhou Y, Li Z. Synthesis and Structure of Novel Disulfide(trisulfide)‐Containing Thiophenes. SYNTHETIC COMMUN 2007. [DOI: 10.1080/00397910600978101] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Shi‐Ren Deng
- a Department of Chemistry , Wuhan University , Wuhan, China
| | - Tao Wu
- b Department of Chemistry , Shantou University , Shantou, China
| | - Gao‐Qiang Hu
- a Department of Chemistry , Wuhan University , Wuhan, China
| | - Dan Li
- b Department of Chemistry , Shantou University , Shantou, China
| | - Yun‐Hong Zhou
- a Department of Chemistry , Wuhan University , Wuhan, China
| | - Zao‐Ying Li
- a Department of Chemistry , Wuhan University , Wuhan, China
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128
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Brzostowska EM, Paulynice M, Bentley R, Greer A. Planar Chirality due to a Polysulfur Ring in Natural Pentathiepin Cytotoxins. Implications of Planar Chirality for Enantiospecific Biosynthesis and Toxicity. Chem Res Toxicol 2007; 20:1046-52. [PMID: 17580913 DOI: 10.1021/tx7000465] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A low-energy pathway for pentathiepin racemization has been found using density functional theory (DFT) calculations. 3-[1,2,3,4,5]pentathiepin-6-yl-propylamine served as a model compound for tunicate-derived pentathiepins. Pentathiepin racemization becomes a low-energy process in the presence of a thiolate ion nucleophile. It is unknown whether the biosynthetic process for pentathiepins is enantiospecific (Bentley, R. (2005) Chem. Soc. Rev. 34, 609) or whether toxicity differs between enantiomers. However, the ease of thiolate ion attack on the polysulfur ring suggests that nucleophiles may induce optical instability on the laboratory time scale. The DFT study predicts that enantiospecific behaviors such as toxicity differences between P- and M-pentathiepins would be difficult to determine experimentally. The computed results fit into a broader picture that nucleophiles assist in ring-opening and equilibration reactions of polysulfanes.
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Affiliation(s)
- Edyta M Brzostowska
- Department of Chemistry and Graduate Center, and The City University of New York (CUNY), Brooklyn College, Brooklyn, New York 11210, USA
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129
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Abu-Yousef IA, Rys AZ, Harpp DN. A novel method for the preparation of unsymmetrical bis (di- and trisulfides) via trityl sulfenyl chlorides: Precursors for cyclic polysulfides. J Sulphur Chem 2007. [DOI: 10.1080/17415990701245065] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Imad A. Abu-Yousef
- a Department of Chemistry , American University of Sharjah , P.O.Box 26666, Sharjah, United Arab Emirates
| | - Andrzej Z. Rys
- b Department of Chemistry , McGill University , H3A 2K6, Montreal, Canada
| | - David N. Harpp
- b Department of Chemistry , McGill University , H3A 2K6, Montreal, Canada
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130
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Aebisher D, Brzostowska EM, Mahendran A, Greer A. Regioselective (biomimetic) synthesis of a pentasulfane from ortho-benzoquinone. J Org Chem 2007; 72:2951-5. [PMID: 17378613 DOI: 10.1021/jo062677w] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A mechanism is proposed for the formation of cyclic 5,6,7,8,9-pentathiabenzocycloheptene-1,2-diol, 4, from the reaction of o-benzoquinone with reduced elemental sulfur, H2Sx. 1,6-conjugate addition to the quinone is favored over 1,4-conjugate addition. Hydrogen bonding to the quinone oxygen enhances the nucleophilicity of H2Sx by facilitating the removal of the S-H proton. We propose that initially formed 3-polysulfidobenzene-diol intermediates are oxidized to their corresponding quinones and closure of the polysulfur ring subsequently takes place at the C3-C4 bond leading to 4. A possible mechanism for the formation of the pentasulfur linkage in 4 is discussed, which is the key moiety found in a number of natural products.
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Affiliation(s)
- David Aebisher
- Department of Chemistry, Graduate Center & The City University of New York (CUNY), Brooklyn College, Brooklyn, New York 11210, USA
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131
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Münchberg U, Anwar A, Mecklenburg S, Jacob C. Polysulfides as biologically active ingredients of garlic. Org Biomol Chem 2007; 5:1505-18. [PMID: 17571177 DOI: 10.1039/b703832a] [Citation(s) in RCA: 126] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Garlic has long been considered as a natural remedy against a range of human illnesses, including various bacterial, viral and fungal infections. This kind of antibiotic activity of garlic has mostly been associated with the thiosulfinate allicin. Even so, recent studies have pointed towards a significant biological activity of trisulfides and tetrasulfides found in various Allium species, including a wide range of antibiotic properties and the ability of polysulfides to cause the death of certain cancer cells. The chemistry underlying the biological activity of these polysulfides is currently emerging. It seems to include a combination of several distinct transformations, such as oxidation reactions, superoxide radical and peroxide generation, decomposition with release of highly electrophilic S(x) species, inhibition of metalloenzymes, disturbance of metal homeostasis and membrane integrity and interference with different cellular signalling pathways. Further research in this area is required to provide a better understanding of polysulfide reactions within a biochemical context. This knowledge may ultimately form the basis for the development of 'green' antibiotics, fungicides and possibly anticancer agents with dramatically reduced side effects in humans.
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Affiliation(s)
- Ute Münchberg
- Division of Bioorganic Chemistry, School of Pharmacy, Building B 2.1, Universität des Saarlandes, PO Box 151150, D-66041, Saarbrücken, Germany
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132
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Steudel R, Steudel Y, Mak AM, Wong MW. Homolytic Dissociation of the Vulcanization Accelerator Tetramethylthiuram Disulfide (TMTD) and Structures and Stabilities of the Related Radicals Me2NCSn• (n = 1−4). J Org Chem 2006; 71:9302-11. [PMID: 17137356 DOI: 10.1021/jo061345o] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The homolytic dissociation of the important vulcanization accelerator tetramethylthiuram disulfide (TMTD) has been studied by ab initio calculations according to the G3X(MP2) and G3X(MP2)-RAD theories. Homolytic cleavage of the SS bond requires a low enthalpy of 150.0 kJ mol-1, whereas 268.0 kJ mol-1 is needed for the dissociation of one of the C-S single bonds. To cleave one of the SS bonds of the corresponding trisulfide (TMTT) requires 191.1 kJ mol-1. Me2NCS2* is a particularly stable sulfur radical as reflected in the low S-H bond dissociation enthalpy of the corresponding acid Me2NC(=S)SH (301.7 kJ mol-1). Me2NCS2* (2B2) is a sigma radical characterized by the unpaired spin density shared equally between the two sulfur atoms and by a 4-center (NCS2) delocalized pi system. The ESR g-tensors of the radicals Me2NCSn* (n = 1-3) have been calculated. Both TMTD and the mentioned radicals form stable chelate complexes with a Li+ cation, which here serves as a model for the zinc ions used in accelerated rubber vulcanization. Although the binding energy of the complex [Li(TMTD)]+ is larger than that of the isomeric species [Li(S2CNMe2)2]+ (12), the dissociation enthalpy of TMTD as a ligand is smaller (125.5 kJ mol-1) than that of free TMTD. In other words, the homolytic dissociation of the SS bonds of TMTD is facilitated by the presence of Li+ ions. The sulfurization of TMTD in the presence of Li+ to give the paramagnetic complex [Li(S3CNMe2)2]+ is strongly exothermic. These results suggest that TMTD reacts with naked zinc ions as well as with the surface atoms of solid zinc oxide particles in an analogous manner producing highly reactive complexes, which probably initiate the crosslinking process during vulcanization reactions of natural or synthetic rubber accelerated by TMTD/ZnO.
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Affiliation(s)
- Ralf Steudel
- Institut für Chemie, Technische Universität Berlin, Sekr. C2, 10623 Berlin, Germany.
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133
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Deng S, Wu L, Wang H, Zhou B, Wong W, Guo J, Li Z, Zhou Y. Synthesis and Structure of a Novel Disulfide‐Containing Aniline. SYNTHETIC COMMUN 2006. [DOI: 10.1081/scc-200046525] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Shi‐Ren Deng
- a Department of Chemistry , Wuhan University , Wuhan, 430072, P. R. China
| | - Lei Wu
- a Department of Chemistry , Wuhan University , Wuhan, 430072, P. R. China
| | - Hao Wang
- a Department of Chemistry , Wuhan University , Wuhan, 430072, P. R. China
| | - Bin Zhou
- a Department of Chemistry , Wuhan University , Wuhan, 430072, P. R. China
| | - Wai‐Kwok Wong
- b Department of Chemistry , Hong Kong Baptist University , Hong Kong, P. R. China
| | - Jian‐ping Guo
- b Department of Chemistry , Hong Kong Baptist University , Hong Kong, P. R. China
| | - Zao‐Ying Li
- a Department of Chemistry , Wuhan University , Wuhan, 430072, P. R. China
| | - Yun‐Hong Zhou
- a Department of Chemistry , Wuhan University , Wuhan, 430072, P. R. China
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134
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Skyllberg U, Bloom PR, Qian J, Lin CM, Bleam WF. Complexation of mercury(II) in soil organic matter: EXAFS evidence for linear two-coordination with reduced sulfur groups. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2006; 40:4174-80. [PMID: 16856732 DOI: 10.1021/es0600577] [Citation(s) in RCA: 223] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The chemical speciation of inorganic mercury (Hg) is to a great extent controlling biologically mediated processes, such as mercury methylation, in soils, sediments, and surface waters. Of utmost importance are complexation reactions with functional groups of natural organic matter (NOM), indirectly determining concentrations of bioavailable, inorganic Hg species. Two previous extended X-ray absorption fine structure (EXAFS) spectroscopic studies have revealed that reduced organic sulfur (S) and oxygen/ nitrogen (O/N) groups are involved in the complexation of Hg(II) to humic substances extracted from organic soils. In this work, covering intact organic soils and extending to much lower concentrations of Hg than before, we show that Hg is complexed by two reduced organic S groups (likely thiols) at a distance of 2.33 A in a linear configuration. Furthermore, a third reduced S (likely an organic sulfide) was indicated to contribute with a weaker second shell attraction at a distance of 2.92-3.08 A. When all high-affinity S sites, corresponding to 20-30% of total reduced organic S, were saturated, a structure involving one carbonyl-O or amino-N at 2.07 A and one carboxyl-O at 2.84 A in the first shell, and two second shell C atoms at an average distance of 3.14 A, gave the best fit to data. Similar results were obtained for humic acid extracted from an organic wetland soil. We conclude that models that are in current use to describe the biogeochemistry of mercury and to calculate thermodynamic processes need to include a two-coordinated complexation of Hg(II) to reduced organic sulfur groups in NOM in soils and waters.
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Affiliation(s)
- Ulf Skyllberg
- Department of Forest Ecology, Swedish University of Agricultural Sciences, S-901 83 Umeå, Sweden.
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135
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Ishii A, Suzuki M, Yamashita R. Preparation of a new 1,2,3-trithiolane, trans-9,10,11-trithiabicyclo[6.3.0]undecane, and its oxidation reactions. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.03.044] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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136
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Majchrzak A, Mlostoń G, Linden A, Heimgartner H. Reactions of Chlorosulfanyl Derivatives of Cyclobutanones with Different Nucleophiles. Helv Chim Acta 2006. [DOI: 10.1002/hlca.200690082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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137
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Plummer MA, Cowley SW. Chemical mechanisms in hydrogen sulfide decomposition to hydrogen and sulfur. MOLECULAR SIMULATION 2006. [DOI: 10.1080/08927020600599691] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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138
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139
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Abu-Yousef IA, Rys AZ, Harpp DN. Preparation and reactivity of unsymmetrical di- and trisulfides. J Sulphur Chem 2006. [DOI: 10.1080/17415990500496497] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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140
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García‐Valverde M, Torroba T. Heterocyclic Chemistry of Sulfur Chlorides – Fast Ways to Complex Heterocycles. European J Org Chem 2006. [DOI: 10.1002/ejoc.200500786] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- María García‐Valverde
- Química Orgánica, Facultad de Ciencias, Universidad de Burgos, 09001 Burgos, Spain, Fax: +34‐947‐258087
| | - Tomás Torroba
- Química Orgánica, Facultad de Ciencias, Universidad de Burgos, 09001 Burgos, Spain, Fax: +34‐947‐258087
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141
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Belen’kii L, Gramenitskaya V, Evdokimenkova Y. The Literature of Heterocyclic Chemistry, Part IX, 2002–2004. ADVANCES IN HETEROCYCLIC CHEMISTRY 2006. [DOI: 10.1016/s0065-2725(06)92004-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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142
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Jacob C. A scent of therapy: pharmacological implications of natural products containing redox-active sulfur atoms. Nat Prod Rep 2006; 23:851-63. [PMID: 17119635 DOI: 10.1039/b609523m] [Citation(s) in RCA: 246] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A range of sulfur-containing natural products from plants, fungi, bacteria and animals have recently been investigated to determine their therapeutic potential. Preliminary in vitro and in vivo studies of compounds such as ergothioneine, ovothiols, allicin, leinamycin, varacin, lenthionine and diallyltetrasulfide have provided evidence for antioxidant, antibacterial, antimicrobial, antifungal and anticancer properties. The biological activity of these compounds is the result of specific chemical properties which converge in chemotypes such as thiols, disulfides, sulfenic and sulfinic acids,thiosulfinates, sulfoxides, sulfones and polysulfides. Redox-activity, catalysis, metal binding, enzyme inhibition and radical generation allow reactive sulfur species to interact with oxidative stressors, to affect the function of redox-sensitive cysteine proteins and to disrupt the integrity of DNA and cellular membranes. In some cases, the biological activity of sulfur-containing plant products depends on initial enzymatic activation, which allows thiosulfinates and isothiocyanates to be generated with high target selectivity. Not surprisingly, research into the biochemical and pharmacological properties of the lesser known sulfur chemotypes is rapidly gathering momentum.
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Affiliation(s)
- Claus Jacob
- Division of Bioorganic Chemistry, School of Pharmacy, Universität des Saarlandes, Postfach 151150, D-66041, Saarbrücken, Germany.
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143
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Macho S, Miguel D, Gómez T, Rodríguez T, Torroba T. From cyclopentanone oximes to bis[1,2,3]dithiazolo-s-indacenes, cyclopenta[c][1,2]thiazine, pentathiepino-, tetrathiino-, and thienocyclopenta[1,2,3]dithiazoles as a rich source of new materials. J Org Chem 2005; 70:9314-25. [PMID: 16268604 DOI: 10.1021/jo0514117] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[Structure: see text]. The 1,5- and 1,7-s-hydrindacenedione dioximes reacted with S2Cl2 and iBu3N to give the first examples of bis[1,2,3]dithiazolo-s-indacenes; one of them was a near-infrared dye. In contrast, the silylated bicyclo[3.3.0]octan-2,6-dione dioxime reacted with S2Cl2 and Et3N to give a bicyclic 4-cyanoethylcyclopenta[1,2,3]dithiazole or, after addition of Li2S, a tricyclic 4-cyanoethyl-5,6-pentathiepinocyclopenta[1,2,3]dithiazole, also obtained from 2-cyanoethylcyclopentanone oxime, S2Cl2, and Hünig's base. In related reactions, 2-oxocyclopentylpropionate oxime gave the expected cyclopenta[1,2,3]dithiazole, in addition to an unexpected cyclopenta[c][1,2]thiazine that showed a reversible reduction wave in its CV at -0.95 V. Ethyl 2-oxocyclopentanecarboxylate oxime reacted with S2Cl2, Hünig's base, and Li2S to give a 5,6-tetrathiinocyclopenta[1,2,3]dithiazole derivative. Cyclopentathiophen-4-one oximes reacted with S2Cl2 and iBu3N to give thienocyclopenta[1,2,3]dithiazoles that showed UV-vis spectral bands that depended on the positions of the ring fusion.
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Affiliation(s)
- Sonia Macho
- Química Orgánica, Facultad de Ciencias, Universidad de Burgos, 09001 Burgos, Spain
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144
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Arisawa M, Fujimoto K, Morinaka S, Yamaguchi M. Equilibrating C−S Bond Formation by C−H and S−S Bond Metathesis. Rhodium-Catalyzed Alkylthiolation Reaction of 1-Alkynes with Disulfides. J Am Chem Soc 2005; 127:12226-7. [PMID: 16131192 DOI: 10.1021/ja0527121] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In the presence of a catalytic amount of RhH(PPh3)4 (2 mol %) and 1,1'-bis(diphenylphosphino)ferrocene (dppf) (3 mol %), silylacetylenes reacted with dialkyl disulfides giving 1-alkylthio-2-trialkylsilylethynes in high yields. Alkanethiols liberated in this reaction did not interfere with the reaction, and the addition to silylacetylene forming 1-alkylthio-1-alkenes could be minimized under the conditions. Alkylacetylenes and arylacetylenes also reacted with disulfides when the alkyl or aryl groups were bulky. Diaryl disulfides gave arylthio derivatives under slightly modified conditions. The C-S bond-forming reaction is reversible: A reaction of a thiol and a 1-alkylthio-1-alkyne in the presence of the rhodium catalyst gave a 1-alkyne; alkylthio exchange reaction proceeded between a 1-alkylthio-1-alkyne and a disulfide. This is an equilibrating oxidative reaction of organic molecules with C-H and S-S bond metathesis forming C-S and S-H bonds.
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Affiliation(s)
- Mieko Arisawa
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Sendai, 980-8578, Japan
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145
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Arisawa M, Tanaka K, Yamaguchi M. Rhodium-catalyzed sulfur atom exchange reaction between organic polysulfides and sulfur. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.05.024] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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146
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Nagahora N, Ogawa S, Kawai Y, Sato R. Synthesis, structure, and electrochemical properties of biferrocenes annulated with 1,2-dithiin and 1,2-dithiin 1,1-dioxides. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.04.068] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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147
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Steudel Y, Wong MW, Steudel R. Electrophilic Attack on Sulfur-Sulfur Bonds: Coordination of Lithium Cations to Sulfur-Rich Molecules Studied by Ab Initio MO Methods. Chemistry 2005; 11:1281-93. [PMID: 15627950 DOI: 10.1002/chem.200400852] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Complex formation between gaseous Li+ ions and sulfur-containing neutral ligands, such as H2S, Me2Sn (n = 1-5; Me = CH3) and various isomers of hexasulfur (S6), has been studied by ab initio MO calculations at the G3X(MP2) level of theory. Generally, the formation of LiS(n) heterocycles and clusters is preferred in these reactions. The binding energies of the cation in the 29 complexes investigated range from -88 kJ mol(-1) for [H2SLi]+ to -189 kJ mol(-1) for the most stable isomer of [Me2S5Li]+ which contains three-coordinate Li+. Of the various S6 ligands (chair, boat, prism, branched ring, and triplet chain structures), two isomeric complexes containing the S5==S ligand have the highest binding energies (-163+/-1 kJ mol(-1)). However, the global minimum structure of [LiS6]+ is of C(3v) symmetry with the six-membered S(6) homocycle in the well-known chair conformation and three Li--S bonds with a length of 256 pm (binding energy: -134 kJ mol(-1)). Relatively unstable isomers of S6 are stabilized by complex formation with Li+. The interaction between the cation and the S6 ligands is mainly attributed to ion-dipole attraction with a little charge transfer, except in cations containing the six sulfur atoms in the form of separated neutral S2, S3, or S4 units, as in [Li(S3)2]+ and [Li(S2)(S4)]+. In the two most stable isomers of the [LiS6]+ complexes, the number of S--S bonds is at maximum and the coordination number of Li+ is either 3 or 4. A topological analysis of all investigated complexes revealed that the Li--S bonds of lengths below 280 pm are characterized by a maximum electron-density path and closed-shell interaction.
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Affiliation(s)
- Yana Steudel
- Institut für Chemie, Technische Universität Berlin, Sekr. C2, 10623 Berlin, Germany.
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148
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Wong MW, Steudel Y, Steudel R. Novel isomers of hexasulfur: Prediction of a stable prism isomer and implications for the thermal reactivity of elemental sulfur. J Chem Phys 2004; 121:5899-907. [PMID: 15367018 DOI: 10.1063/1.1785143] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
High-level ab initio molecular orbital calculations were employed to explore the potential energy hypersurface of hexasulfur, S(6). Twelve isomeric structures of S(6) have been identified: two unbranched rings (chair and boat), one trigonal prism of D(3h) symmetry, two singly branched rings (S(5)double bondS), three triplet chains, one singlet chain, and three doubly branched rings (Sdouble bondS(4)double bondS). The prism structure is essentially a cluster of three S(2) molecules connected via a six-center pi(*)-pi(*)-pi(*) interaction. It is by 51 kJ mol(-1) less stable than the lowest-energy chair form. The reactions to generate the boat, the prism, and the singly branched isomers from the chair form are predicted to have lower barriers than the ring opening reaction of cyclo-S(6), which requires an activation energy of 149 kJ mol(-1). The prism and singly branched isomers are found to be more reactive species than the chair form and they are potential sources of S(2) in chemical reactions involving elemental sulfur.
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Affiliation(s)
- Ming Wah Wong
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.
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149
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Wong MW, Chwee TS, Steudel R. Electrophilic Attack on Sulfur−Sulfur Bonds. 1. Protonation of Various Isomers of the Homoatomic Sulfur Molecules Sn (n = 2−8). J Phys Chem A 2004. [DOI: 10.1021/jp048017h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ming Wah Wong
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, and Institut für Chemie, Technische Universität Berlin, Sekr. C2, D-16023 Berlin, Germany
| | - Tsz Sian Chwee
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, and Institut für Chemie, Technische Universität Berlin, Sekr. C2, D-16023 Berlin, Germany
| | - Ralf Steudel
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, and Institut für Chemie, Technische Universität Berlin, Sekr. C2, D-16023 Berlin, Germany
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150
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Brzostowska EM, Greer A. Polysulfane Antitumor Agents from o-Benzyne. An Odd−Even Alternation Found in the Stability of Products o-C6H4Sx (x = 1−8). J Org Chem 2004; 69:5483-5. [PMID: 15287803 DOI: 10.1021/jo049418w] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Benzyne is shown to add elemental sulfur and give rise to a series of polysulfane compounds. A computational and experimental study is presented. Odd-membered o-C6H4Sx rings (x = 1-8), except x = 1, which suffers from ring strain, have enhanced stability compared to even-membered rings. The acquisition of "odd-even" data may shed new light, revealing patterns on polysulfane stability and structure.
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Affiliation(s)
- Edyta M Brzostowska
- Department of Chemistry, Graduate School and University Center & The City University of New York (CUNY), Brooklyn College, Brooklyn, New York 11210, USA
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